P2652 Buick B Rocker Arm Actuator System Stuck On (Bank 1)
Possible causes
– Low engine oil level
– Faulty Rocker Arm Oil Control Solenoid
– Faulty EOP (Engine Oil Pressure) sensor
– Incorrect oil type used
– Engine mechanical condition
– Faulty Rocker Arm Oil Control Solenoid
– Faulty EOP (Engine Oil Pressure) sensor
– Incorrect oil type used
– Engine mechanical condition
Tech description
The most common problem that can set the P2652 Buick code is the engine oil. Before replacing any parts change the engine oil with the factory recommend oil weight.
What about the obd code?
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the Powertrain Control Module (PCM) memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P2652 Buick Description
The VTEC system activates rocker arm oil control solenoid B by command from the Powertrain Control Module (PCM), and it charges/discharges the hydraulic circuit of the VTEC mechanism that switches valve timing between Low and High. The PCM monitors oil pressure in the hydraulic circuit of the VTEC mechanism using rocker arm oil pressure switch B downstream of rocker arm oil control solenoid B. If there is a difference between the oil pressure condition in the hydraulic circuit determined by the PCM command and the oil pressure condition determined by the status of rocker arm oil pressure switch B, the system is considered faulty, and a DTC is stored.
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